Alida runs her toy car on dry marble floor, wet marble floor, newspaper and towel spread on the floor. The force of friction acting on the car on different surfaces in increasing orderwill be

(a) wet marble floor, dry marble floor, newspaper and towel.


(b) newspaper, towel, dry marble floor, wet marble floor.


(c) towel, newspaper, dry marble floor, wet marble floor


(d) wet marble floor, dry marble floor, towel, newspaper

Option (a) i.e. wet marble floor, dry marble floor, newspaper and towel.

As the roughness of the surface increases, the friction force increases.


10